Condensed Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 85,038 $ 56,537
Short-term investments 20,803 3,525
Prepaid clinical development costs 366 196
Other prepaid and current assets 560 362
Total current assets 106,767 60,620
Property and equipment, net 780 81
Intangible assets 56 56
Long-term investments 35,741 17,537
Total assets 143,344 78,294
Current liabilities:    
Accounts payable 2,040 2,232
Current portion of long-term debt 638  
Accrued clinical development costs 1,978 884
Other accrued liabilities 835 1,087
Total current liabilities 5,491 4,203
Long-term debt, net of discount 4,299  
Total liabilities 9,790 4,203
Commitments and contingencies (Note 5)      
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized and no shares issued or outstanding as of December 31, 2014 and December 31, 2013      
Common stock, $0.001 par value; 120,000,000 shares authorized as of December 31, 2014 and December 31,2013; 20,352,876 shares issued 20,343,325 outstanding at December 31, 2014 and 15,357,413 shares issued and 15,340,710 outstanding at December 31, 2013 20 15
Additional paid-in capital 238,031 142,142
Accumulated other comprehensive loss (59) (3)
Accumulated deficit (104,438) (68,063)
Total stockholders' equity 133,554 74,091
Total liabilities and stockholders' equity $ 143,344 $ 78,294